Update php versioning in composer.json

Updated the php versioning requirements inside the composer.json file.
Merge branch 'master' of github.com:CodeSleeve/stapler into development
Clean up fasten command.

Cleaned up the syntax of the faten command, removed extraneous try catch
block, etc.
Clean up IOWrapper library.

Changed the 'createFromString' method to work with existing file on the
local filesystem, created a new method 'createFromUrl' to handle the
processing of remote files.
Implement the ability to refresh images.

Implemented the ability to refresh images from the artisan command line
by calling a stapler.refresh command.